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In the linear equation 3x + y = 20, if x = 5, then what is y?

Answer and explanation

Correct answer: 5

Given \(3x+y=20\) and \(x=5\), substitute the value of x: \(3(5)+y=20\). Thus, \(15+y=20\). Subtracting 15 from both sides gives \(y=5\). Option 3 is not correct because \(3\times5+3=18\), not 20. Exam tip: After substituting a value, use the same operation on both sides to isolate the remaining variable.

Related tags

Linear EquationsTwo VariablesSubstitutionAlgebraClass 9 MathematicsSubstitution MethodLinear Equations In Two VariablesMathematics

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